tulip release

This release is only the beginning of some exciting changes in Tulip's UI to make it more user-friendly. The CSV import is a good example of how we plan to make powerful features accessible. We also made some nice improvements on rendering speed, and fixed lots of bugs, many of which were reported during the development of 3.5.

Many thanks to all the bug reporters and early testers who helped us stabilize this release more than any before it !